<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">
    <meta name="description" content="Multiple views synced across time and space.">
    <meta name="cesium-sandcastle-labels" content="Beginner, Showcases">
    <title>Cesium Demo</title>
    <script type="text/javascript" src="../Sandcastle-header.js"></script>
    <script type="text/javascript" src="../../../Build/CesiumUnminified/Cesium.js" nomodule></script>
    <script type="module" src="../load-cesium-es6.js"></script>
</head>
<body class="sandcastle-loading" data-sandcastle-bucket="bucket-requirejs.html">
<style>
    @import url(../templates/bucket.css);
    #cesiumContainer {
      display: flex;
      width: 100%;
      height: 100%;
    }
    #view3D {
      display: inline-block;
      width: 100%;
    }
    #view2D {
      display: inline-block;
      width: 100%;
    }
</style>
<div id="cesiumContainer" class="fullSize">
    <div id="view3D"></div>
    <div id="view2D"></div>
</div>
<div id="loadingOverlay"><h1>Loading...</h1></div>
<div id="toolbar"></div>
<script id="cesium_sandcastle_script">
function startup(Cesium) {
    'use strict';
//Sandcastle_Begin
// We want our two views to be synced across time, so we create
// a shared clock object that both views share
var clockViewModel = new Cesium.ClockViewModel();
var options3D = {
    fullscreenButton : false,
    sceneModePicker : false,
    clockViewModel : clockViewModel
};
var options2D = {
    homeButton : false,
    fullscreenButton : false,
    sceneModePicker : false,
    clockViewModel : clockViewModel,
    infoBox : false,
    geocoder : false,
    sceneMode : Cesium.SceneMode.SCENE2D,
    navigationHelpButton : false,
    animation : false
};
// We create two viewers, a 2D and a 3D one
// The CSS is set up to place them side by side
var view3D = new Cesium.Viewer('view3D', options3D);
var view2D = new Cesium.Viewer('view2D', options2D);

var worldPosition;
var distance;

function sync2DView() {
    // The center of the view is the point that the 3D camera is focusing on
    var viewCenter = new Cesium.Cartesian2(Math.floor(view3D.canvas.clientWidth / 2), Math.floor(view3D.canvas.clientHeight / 2));
    // Given the pixel in the center, get the world position
    var newWorldPosition = view3D.scene.camera.pickEllipsoid(viewCenter);
    if (Cesium.defined(newWorldPosition)){
        // Guard against the case where the center of the screen
        // does not fall on a position on the globe
        worldPosition = newWorldPosition;
    }
    // Get the distance between the world position of the point the camera is focusing on, and the camera's world position
    distance = Cesium.Cartesian3.distance(worldPosition, view3D.scene.camera.positionWC);
    // Tell the 2D camera to look at the point of focus. The distance controls how zoomed in the 2D view is
    // (try replacing `distance` in the line below with `1e7`. The view will still sync, but will have a constant zoom)
    view2D.scene.camera.lookAt(worldPosition, new Cesium.Cartesian3(0.0, 0.0, distance));
}

// Apply our sync function every time the 3D camera view changes
view3D.camera.changed.addEventListener(sync2DView);
// By default, the `camera.changed` event will trigger when the camera has changed by 50%
// To make it more sensitive, we can bring down this sensitivity
view3D.camera.percentageChanged = 0.01;

// Since the 2D view follows the 3D view, we disable any
// camera movement on the 2D view
view2D.scene.screenSpaceCameraController.enableRotate = false;
view2D.scene.screenSpaceCameraController.enableTranslate = false;
view2D.scene.screenSpaceCameraController.enableZoom = false;
view2D.scene.screenSpaceCameraController.enableTilt = false;
view2D.scene.screenSpaceCameraController.enableLook = false;
//Sandcastle_End
    Sandcastle.finishedLoading();
}
if (typeof Cesium !== 'undefined') {
    window.startupCalled = true;
    startup(Cesium);
}
</script>
</body>
</html>
